/Engine/Plugins/Enterprise/VariantManager/Source/VariantManager/Public/VariantManager.h
Returns which actors we can add to an existingUVariant, since we only allow one per actor per variant We can force add/replace with AddObjectBindings, but this allows us to check how many will be added, which is used for tooltips and feedback
void CanAddActorsToVariant ( const [TArray](API\Runtime\Core\Containers\TArray)< [UObject](API\Runtime\CoreUObject\UObject\UObject) * > & InActors, const [UVariant](API\Plugins\VariantManagerContent\UVariant) * InVariant, [TArray](API\Runtime\Core\Containers\TArray)< [UObject](API\Runtime\CoreUObject\UObject\UObject) * > & OutActorsWeCanAdd )